Drill mounting



June 10, 1958 R. E. ABENDROTH 2,838,079

DRILL MOUNTING Filed June 18. 1954 5 Sheets-Sheet 1 IN V EN TOR.

June 10, 1958 R E. ABENDROTH 2,833,079

DRILL MOUNTING Filed June 18. 1954 r s Sheets-Sheet 2 INVENTOR.

June 10, 1958 R. E. ABENDROTH 2,838,079

DRILL MOUNTING Filed June 18. 1954 3 Sheets-Sheet 3 IN V EN TOR.

ATTORNEYS United States Patent DRILL MOUNTING Richard E. Abendroth, Minneapolis, Minn. Application June 18, 1954, Serial No. 437,771

16 Claims. (Cl. 144-405) My invention pertains to an improved drill mounting. in particular, it pertains to a mounting for a motor driven hand drill which facilitates drilling upwardly or downwardly into spaced horizontal surfaces.

An object of my invention is to provide an improved drill mounting for a motor driven hand drill which facilitates the holding of a drill and provides leverage for increasing the effectiveness of the manual pressure applied.

Another object of my invention is to provide an improved drill mounting for a motor driven hand drill which is adjustable to provide leverage means for moving the drill vertically upwardly or vertically downwardly.

Another object of my invention is to provide an improved drill mounting for a motor driven hand drill which is adjustable so that it may be supported on a step ladder, on a fixed support, or may be provided with a wheeled support.

Another object of my invention is to provide a frame which is adapted to be supported either on a step ladder or on a wheeled support, a rod supported by the frame for vertical movement with respect thereto, a collar encircling the rod which limits the downward movement of the rod, and a lever connected at one end tosaid collar and its opposite end projecting beyond the limits of said frame and forming an actuating handle, the lever being adjustable between two fulcrum points to adapt my inyention for moving a drill either verticallyupwardly or vertically downwardly.

These and other objects will be disclosed in the course of the following specification and claims, reference being .had to the accompanying drawings wherein:

Fig. 1 is a view in side elevation showing one modification of my invention in operative position on a step ladder;

Fig. 2 is an enlargedfragmentary view in perspective of the modification of my invention shown in Fig. 1;

Fig. 3 is a view in side elevation with a part of the frame broken away of the structure shown in Fig. 2;

Fig. 4 is a view partly in top plan and partly in cross 2 section taken substantially along line 4-4 of Fig. 3;

Fig. 5 is a fragmentary bottom plan view taken along .line 55 of Fig. 3;

Fig; 6 is an enlarged fragmentary view partly in side Pa y section taken along line 77 of Fig. l;

.Fig. 8 is a view partly in side elevation and partly in f ice Fig. 12 is an enlarged fragmentary view in side elevation of the modification of my invention shown in Fig. showing it adapted for drilling upwardly;

Fig. 13 is a view in perspective of a third modification of my invention; and

Fig. 14 is a view partly in perspective, partly in side elevation and partly in cross section showing a fourth modification of my invention.

Referring more particularly to the drawings, reference numeral 18 designates a frame having a front side'12, top side 14, bottom side 16 and end sides 18 and 20. Secured to end side 20 is a flange 22 which extends parallel to front side 12 and partially covers an open side 23 of frame 16. Side 26 has formed therein two slots 24 and 26. Top side 14 and bottom side 16 have formed therein aligned apertures 28 and 341, respectively, which are adapted to receive a hollow rod 32. Referring in particular to Fig. 5, aperture 30 may be formed as a U-shaped cut to facilitate insertion of the rod 32, and a retaining plate 34 having a circular aperture 36 is then secured to the bottom side 16 by bolts 38.

Frame 18 is adapted to be supported between two parallel surfaces 40 and 42, which in most instances are the floor and ceiling of a room; and rod 32 is generally perpendicularly disposed between these two surfaces. Referring particularly to the modifications of my invention shown in Figs. 13 and 1012, frame 10 is adapted to be supported on a step ladder 44 which rests on the surface 42. Leg 46 of ladder 44 is one of the step-supporting legs, and it is positioned between flange 22 and front side 12 of frame 10 as shown in Fig. 2. The lower edge of flange 22 rests on a step 48. A bracket 50 engages an adjacent non step-carrying leg 52 as shown in Fig. 4. Bracket 54) is connected to frame 10 to assist in supporting the frame on step ladder 4 4. This connection is clearly shown by referring to Figs. 4 and 9 Frame 10 caries a projection 54 having a notch 55 through which passes a pin 56 having a head 58. Pin 56 passes through an aperture in bracketStl which is of smaller diameter than the head 58. Pin 56 is tightened in position by passing through an eye 60 carried by a threaded pin 62. Pin 62 passes through an aperture in the front side 12 of frame 10 and is locked in position by a knurled nut 64.

In the form of my invention shown in Fig. 13, frame 10 is adapted so that it may be supported either on step ladder 44 or on a movable support designated by general reference numeral 66. Frame 10 is provided with a bracket 68 which has formed integrally therewith a sleeve 70. A hollow rod 72 is telescopically joined with rod 32 within the frame 10, and frame 10 is positioned on rod 72 by tightening a holding screw 74. End 76 of rod 72, which is opposite the joining with rod 32, is adapted to rest on the surface 42. Adjacent rod 76 is a sleeve 78 positioned on rod 72 by tightening a holding screw 80. Sleeve 78 carries a projection 82 which has secured thereto diverging members 84 and 86. Mounted on members 84 and 86 for rotation with respect thereto are wheels 88 and 90. The form of my invention shown in Fig. 13 specifically discloses a modification for drilling downwardly into surface 42; and this will be subsequently described in detail. However, at this point, the modification of Fig. 13 has been mentioned so that it is also understood that the movable support 66 with the frame 10 shown in Fig. 13 may be substituted for the ladder support of Figs. 1-3; and in which case, frame 10 will function as described with respect to my invention as disclosed in Figs. 1-3.

Encircling rod 32 is a collar 92 having an aperture 94 of slightly larger diameter than the rod 32. Collar 92 is adapted to engage rod 32 in a binding relationship aasaora spasms which limits the downward movement thereof. Extending laterally from collar 92 is an arm 96 to which is secured links 98 and 180. A lever 102 is secured at its end 104 to link 180, and its opposite end is formed as a handle 106 which projects through slot 24 beyond the limits of frame 10. Lever 102 is pivotally connected to frame 10 by pin 10%. A spring 110 is connected at its end 112 to bottom side 16 and its opposite end 114 is connected to end 104 of lever 112 adjacent the connection to link 100. Spring 1110 biases collar 92 downwardly and at an angle to the axis of rod 32. A lever 116 at its end 118 is connected to link 98. Lever 116 extends through slot 26 to its opposite end 120. End 120 has been turned 90 with respect to the remainder of lever 116 to provide an actuating handle which may be operated by the operators foot when he is standing on the steps of ladder 44. In the form of my invention shown in Figs. l-3, lever 116 is pivotally connected at point 121 intermediate of its ends 118 and 120 to frame 10 by means of pin 122, see Fig. 2, and this adapts my invention for drilling upwardly into surface 40 as will be subsequently explained.

Referring more particularly to Figs. ll2, I provide a modified form of my invention which adapts it either for drilling upwardly into surface 40 or downwardly into surface 42. In this modified form of my invention, a strut 124 is removably secured at its ends 126 and 128 to lugs 130 projecting from sides 20 and 16 of frame 10. When lever 116 is pivotally connected at point 121 of lever 116 to strut 124 intermediate of ends 126 and 128, as shown in Fig. 12, this modified structure will operate in the same manner as when lever 116 is directly secured to frame 18 by pin 122 as shown in Figs. l3; and it is adapted for drilling upwardly into surface 40.

The modification shown in Figs. -12 is adapted for drilling downwardly into surface 42 as follows. Strut 124 is released from its connection with lugs 130, and end 128 is connected to lever 116 at point'121. A collar 134 is secured to the lower end 136 of rod 32. Telescopically joining rod 32 at end 136 is a second rod 138. A collar 140 encircles rod 138 in much the same manner as collar 92 encircles rod 32. Collar 140 is provided with oppositely disposed ears 142 and 144. Collar 134 has formed therewith a projecting arm 146 to which is connected end 148 of a spring 150. Spring 150 at its oppo site end 152 is connected to ear 142 of collar 140, and

biases ear 142 upwardly to tilt collar 140 into a binding relationship with rod 138 which limits the downward movement of rod 138 with respect to rod 32. Ear 144 is operatively connected to strut 124 by adjustable links 154 and 156. Bolts 158 join links 154 and 156 into an integral member whose length is dependent upon the amount of overlapping of the links 154 and 156.

When strut 124 is in the position shown in Fig. ll, lever 116 is not secured at a fixed pivot at point 121 as shown in Fig. 12, or secured to the frame at approximately the same point by pin 122 as shown in Fig. 3. This results in spring 110 positioning end 118 of lever 116, in a position of rest, lower in relation to frame 10 than desirable for an etfective binding relationship between rod 32 and collar 92. Therefore, in this modification, a buffer spring 159 is connected to end side at the upper limit of slot 26 which acts to lower end 120 of lever 116. The lowering of end 120 in respect to frame 10 will fulcrum lever 116 to some extent about point 121 to raise end 118; and this acts to increase the effective binding relationship between rod 32 and collar 92.

Referring to Figs. 68, a mounting head 160 is adapted to receive a motor driven hand drill 162. Drill 162 is provided with a Urshaped handle 164 which is generally tilted with respect to the drill 162, Fig. 8; and drill 162 is generally provided with a rod-shaped handle 166 disposed at 90 with respect to handle 164. Mounting head 160 is provided with a series of parallel rectangular channels 168 separated by ribs 1'70. A pair of elongated members 172 and 174 of unequal length are placed in adjacent channels 168 and tightened together against a common rib 170 by bolts 176. The longer member 174 at an end 178 has an aperture 180 to receive handle 166. A nut 182 is threaded on handle 166 to secure member 174 of the mounting head to the drill 162. Several channels 168 and ribs are provided to adapt the mounting head 160 for varrious shaped or sized drills. Mounting head 160 is provided with a cylindrical bore 184 parallel to channels 168 which is adapted to receive either the upper end 186 of rod 32 or the lower end 188 of rod 138 depending on whether the invention is adapted for drilling surface 40 or surface 42, see Figs. 1 and 10. Mounting head 160 is secured to rod 32 or rod 138 by a screw 190, see Fig. 7. Adjacent the upper end of bore 184 is formed oppositely disposed slots 192 and 194 which extend from the top of mounting head 160 downwardly unequal lengths, as shown in Fig. 8, to adapt mounting head 160 to receive the tilted handle 164. Mounting head 160 is provided with a third slot 196 disposed at an angle of 90 with respect to slots 192 and 194 to adapt it to receive hand drills having handles disposed differently than handle 164.

In the form of my invention shown in Fig. 13, I not only provide a movable support 66 as previously disclosed, but also a modification for drilling downwardly into surface 42 which differs from the form disclosed in Figs. 10-12. A collar 198 having an opening 200 of slightly larger diameter than rod 72 encircles rod 72 intermediate of its end 76 and its joining with rod 32. Collar 1.98 has an car 202 projecting laterally therefrom to which is pivotally secured a link 204. Link 204 opposite its connection with ear 202 is pivotally secured to end 206 of lever 203. The opposite end of lever 208 is formed as a handle 210. Intermediate of ends 206 and 210 at point 212, a link 214 connects lever 208 to a short rod 216. Rod 216 is positioned in bore 184 of mounting head 160, as shown in Fig. 6 in respect to rod 32.

When it is desired to adaptthis modification for drilling downwardly into surface 42, rod 32 is positioned upwardly until end 186 is in abutting relationship with upper surface 40; and collar 92 maintains this position of rod 32. More specifically in this regard, frame 10, collar 92 and the associated linkage and levers as already described with respect to my invention as disclosed in Figs. 1-3, function to raise rod 32 upwardly until abutting upper surface 40 and to maintain this position of rod 32 as also has been described with respect to my invention as specifically disclosed in Figs. l3. When the operator pushes downwardly on handle 210 lever 208 will fulcrum about point 212 to raise end 206. This acts to tilt collar 198 into a binding relationship with rod 72 which would tend to push rod 72-upwarcl. Since any upward movement of rod 72 is prevented by the abutting relationship of end 186 of rod 32 with surface 40, further downward movement of handle 210 fulcrums lever 208 about end 206 to apply considerable downward force at point 212 which acts to force the drill bit 218 into surface 42.

Fig. 14 illustrates a modified form of my invention wherein it is adapted to be secured to a fixed support such as a scafiold. A frame 220 has oppositely disposed projections 222 and 224- carrying C-clamps 226. Each of the clamps 226 are provided with clamp screws 228 which are adapted to engage upstanding braces of the scaffold. Frame 220 has oppositely disposed apertures 230 and 232 through which passes a rod 234. A collar 236 having an opening 238 of slightly larger diameter than rod 234 encircles rod 234. Collar 236 is formed by shaping the intermediate portion of a single elongated strip and joining the two adjacent end portions 240 at point 242. End portions 240 extend beyond point 242 to form an operating arm 244. I A strut 246 is secured to lugs 248 carried by the frame 220. A: lever 250 carries a pivotal link 252. End 254 of lever 250 and end 256 of link 252 are adjustable between two positions as shown in'Fig. 14. In one position, end 254 of lever 250 is pivotally secured to strut 246 and end 256 of link 252 is secured to arm 244. In the second position, end 254 of lever 250 is secured to arm 244 and end 256 of link 252 is secured to lug 258 carried by frame 220. Lever 250 extends from within said frame 220 through a slot 260 to a handle end 262. A G-clamp 264 is secured to the scaffold and carries an apertured bracket 266 to further support the rod 234.

When lever 250 and link 252 are in their first position as shown in full lines in Fig. 14, a downward movement of handle 252 by the operator fulcrums rod 250 about its end 254 and acts to move link 252 downwardly. The downward movement of end 256 of link 252 tilts the operating arm 244 so that collar 236 moves into a binding relationship with rod 234; and thereafter, further downward movement of handle 262 acts to controllably move rod 234 downwardly. When lever 250 and link 252 are in their second position as shown in dotted lines .in Fig. 14, collar 236 is in the binding relationship shown which limits the downward movement of rod 234 with respect to frame 220. Downward movement of handle 262 by the operator acts to fulcrum lever 250 about its connection with link 252 which raises end 254. As end 254 is secured to operating arm 244, the raising of end 254 acts to controllably move rod 234 upwardly inrespect to frame 220. V

The operation of the modification shown in Fig. 13 when adapted for drilling downwardly into surface 42 has already been explained. The operation of the modification shown in Fig. 13 when adapted for drilling upwardly into surface 40 will be the same for the modifications shown in Fig. 12 and in Figs. 1-3; and is as follows. Collar 92 is maintained in a binding relationship with rod 32 which limits the downward movement of rod 32 with respect to the frame 10. The release of this binding relationship between collar 92 and rod 32 is effected by an upward movement of handle 106 of lever 102. Drill 162 is positioned in mounting head 160 as shown in Fig. 6 and mounting head 160 is then positioned on end 186 of rod 32 as shown in Fig. l. The bit is properly positioned over the point on surface 40 which is to be drilled by moving ladder 44 or support 65 to the proper position. The bit of drill 162 is then positioned the proper distance from surface 40 by moving rod 32 upwardly, and this position is maintained by the binding relationship with collar 92. Lever 116 is maintained in the position shown in Figs. 2 and 3 and Fig. 12 until handle 120-is moved downwardly by the operator; and this position is the starting position. The operator, by moving handle 12% of lever 116 down- Wardly with his foot, fulcrums the lever about point 121 which raises end 118 which controllably moves rod 32 upwardly. The upward movement of rod 32 forces the bit of drill 162 into surface 40. 7 When handle 120 reaches the extent of movement in a downwardly direction, if pressure by, the operator is released, spring 110 acts to return collar 92, rod 32 and lever 116 to their starting positions. If the proper depth of hole drilled into surface 40 can be accomplished by a single movement of handle 120 from its starting position to the limit of its movement in a downwardly direction, ladder 44 may be moved to drill a like hole in a different position on surface 40; however, if a single movement of handle 12 is insufiicient to drill a hole to the proper depth, rod 32 may be manually held to maintain the upward movement of rod 32- so that when spring 110 returns collar 92 and lever 116 to their starting positions, a further downward movement of handle 120 will effect a further upward movement of rod 32.

The modification of Figs. '10 and 11 adapts my invention for drilling downwardly into surface 42 as follows.

End 186 of rod 32 is moved into abuttingrelationship with surface '40 and this is maintained by the binding relationship of collar {#2 with rod 32.

When'the parts are positioned as shown in Fig. l0, downward movement of rod 138 with respect to rod 32 is limited by collar 140. A downward movement of handle 120 of lever 116 fulcrums lever 116 about its end 118 to move end 126 of strut 124 downwardly. This downward movement is transmitted through link members 154 and 156 to ear 144 and collar 140. The downward movement of collar 140 which is in a binding relationship with rod 138 acts to force rod 138 downwardly with respect to rod 32. This controllably moves the bit of drill 162 into the surface 42. When strut 124 is in the position shown in Fig. 11, lever 102 is not too effective in releasing the binding relationship between collar 92 and rod 32; therefore in this modification, the binding relationship is released by moving handle of lever 116 upwardly. Releasing this binding relationship allows rod 32 to move downwardly from its abutting relationship with surface 40 so that the drill may be positioned for drilling a second hole in surface 42 or the parts of my invention may be dismantled for storing.

It will be obvious to those skilled in the art that my invention may be modified by many substitutions and equivalents and that this disclosure is intended to be illustrative only. Therefore, I intend to be limited solely by the scope of the appended claims.

What I claim is:

l. A drill mounting comprising a frame adapted to be supported between two spaced generally horizontal surfaces, a generally vertically disposed rod carried by said frame for longitudinal movements with respect thereto, a collar of slightly larger diameter than said rod encircling said rod, said collar being carried by said frame and adapted to engage said rod in a binding relationship which limits the downward movement of said rod, yielding resilient means connected to said collar and said frame biasing said collar downwardly and at an angle with respect to the axis of said rod, a lever connected adjacent one end with said collar and at its opposite end projecting beyond the limits of said frame and forming a handle to actuate said lever for moving said collar relative to said frame when it is in a binding relationship with said rod for moving said rod longitudinally with respect to said frame, and a second lever fulcrumed intermediate of its ends to said frame, one end of said second lever connected to said collar adjacent the connection with said resilient means and the opposite end of said second lever'projecting beyond the limits of said frame to form an actuating handle adjacent said first-named handle for moving said collar against the bias of said yielding resilient means to take said collar out of binding relationship withsaid rod.

2. The structure defined in claim 1, wherein said firstnamed lever is adjustable between two fulcrum points fixed with respect to said frame, one of said fulcrum points being intermediate of the ends of said lever and the other at the end connected to said collar, the end fulcrum point being fixed by abutting the upper end of said rod against the upper of said parallel surfaces and the intermediate fulcrum point being fixed by releaseably securing said lever at said point to said frame, whereby movement of the handle of said first-named lever downwardly about said intermediate fulcrum point is adapted to raise said rod in relation to said frame and movement of said handledownwardly about said end fulcrum point is adapted to lower the points of said first-named lever from said end fulcrum point to the opposite end of said lever in relation to said frame.

3. A drill mounting comprising, a frame adapted to which ilimits the downward movement; of said rod, an

dim Secured to said collar and extending laterally therefrom, a' spring connected to said'arm and said frame biasing said collar downwardly and at an angle with respect to' the axis of said rod, a lever fulcrumed intermediate of its ends to said frame, one end of said lever connected to said arm adjacent the connection with said spring and the opposite end of said lever projecting beyond the limits of said frame to form an actuating handle, a second lever fulcrumed intermediate of its ends to said frame, one end of said second lever being connected to said arm and the opposite end of said second lever extending beyond the limits of said frame to form an actuating handle adjacent said first-named handle.

4. The structure defined in claim 3, wherein said frame is adapted to be removably secured to the side of a step ladder supported upright on a floor, said frame positioned so that both of said handles project adjacent to the steps of said ladder and transverse to the plane formed by the outer edge of the two legs supporting said steps.

5. The structure defined in claim 3, in combination with a support for said frame comprising, a second rod telescopically joined with said first-named rod, a sleeve secured to said frame movable on said second rod, adjustable means carried by said sleeve positioning said sleeve on said second rod, the end of said second rod opposite the joining with said first-named rod adapted to rest on the l-ower'of said surfaces, a sleeve adjustably mounted on said last-mentioned end, two diverging members secured to said last-mentioned sleeve, and a wheel rotatably mounted on each of said members and adapted to engage the lower of said surfaces.

6. The structure defined in claim 5 and in combination therewith, a collar of slightly larger diameter than said second rod encircling said second rod, an arm projecting laterally from said collar, a lever pivotally connected at one end to said arm and its opposite end formed as a handle to actuate said lever, a mounting head adapted to receive a motor driven hand drill, and means connecting said mounting head to said lever intermediate of its ends, whereby when the upper end of said first-named rod is positioned in abutting relationship with the upper of said surfaces said last-mentioned lever is adapted to apply considerable downward force to the drill supported by said mounting head.

7. A drill mounting comprising, a frame adapted to be supported on a horizontal surface and spaced downwardly from an upper surface parallel to said first-named surface, a generally vertically disposed rod carried by said frame for longitudinal movements with respect thereto, a collar of slightly larger diameter than said rod encircling said rod, said collar being carried by said frame and adapted toengage said rod in a binding relationship which. limits the downwardmovement of said rod, a lever carried-by said frame having one end extending beyond the lateral limits thereof to form a handle and at its opposite end being pivotally connected to said collar, 21 second rod telescopically joined with the lower end of said first-named rod, means engaging both of said rods limiting the downward movement of said second rod withrespect to said first-named rod, the upper end of said first-named rod positioned iniabutting relationship with the upper of said surfaces, amounting head carried by said second rod adjacent its end opposite the joining of said first-named rod and adapted to receive a motor driven hand drill, and means connecting said lever intermediate of its ends to said first-named means, whereby the downward movement of the handle of said lever controllably moves said second rod downwardly with respect to saidifirst-named rod.

8. The structure defined in claim'7 wherein said firstnamed means comprises a second collar of slightly larger diameter than said second rod encircling said second rod, ears projecting laterally on opposite sides of said collar,

a'rne mber removably secured to the lower end of said first-named rod, and resilient means connectedbetweeul said member and one-0f said ears to bias said collar in a bindingrelationship with said second rod.

9. A drill mounting comprising, a fixed support, a frame adapted to be secured to said fixed support, a rod carried by said frame for movement in two opposed directions; a collar of slightly larger diameter than said rod encircling'said rod, said collar being carried by said frame and adapted to engagesaid rod in a binding relationship which limits the movement of said rod in one ion defined as a downwardly direction, a lever can rice by said frame having one end extending beyond the limits thereof to form an actuating handle, a link pivotally secured at one end to said lever intermediate of its ends, thecnd of said lever opposite said handle and end of said link opposite the connection with said lever being'adjustable between two positions, said lastrnentioned end of said lever being pivotally secured to said frame and said last mentioned end of said link pivotally secured to said-collar to form the first p ition, said last-mentioned end of said lever being pivotally secured to said collar and said last-mentioned end of said link being pivotally secured to said frame to form the second position, whereby said lever and said link being in said first position the movement of said handle in s id downwardly direction controllably moves said red i same direction and said lever and said link being second position the movement of said handle in the downwardly direction controllably moves said rod in the opposite direction.

10. A drill mounting comprising, a frame adapted to be supported on a horizontal lower surface and downwardlyfrom an upper surface parallel to said lower surface, a generally vertically disposed rod carried by said frame for longitudinal movements with respect thereto, a collar of slightly larger diameter than said encircling said rod, said collar being carried by said frame and adapted to engage said rod in a binding relation ship which limits the downward movement of said rcd toward said lower surface, a lever carried by said frame having one end extending beyond the limits thereof to form an actuating handle, the opposite end of said lever being pivotally secured to said, collar, and an elongated link adjustable between two positions with respect to said lever and said frame, said link being secured adjacent its ends to said frame and pivotally connected intermediate of its ends to said lever between said levers handle and its connection with said collar to form the first position and said link being pivotally connected at one end to said lever at the same point between its handle and the connection between said collar to form the second position.

11. A drill mounting comprising, a frame adapted to be supported on a horizontal lower surface and spaced downwardly from an :upper surface parallel to said lower surface, said frame having front, top, bottom and two end sides forming an enclosure, said top and bottom sides being positioned parallel to said surfaces and each having an aligned aperture, one of said end sides having two parallel slits, a flange connected to said last-mentioned end side andextending parallel to said front side to partially cover the open side of said enclosure, a sleeve secured to said bottom side and aligned with said apertures, a rod supported by said frame and extending through said apertures beyond the top side of said enclosure, a collar of slightly larger diameter than said rod positioned within said enclosure and encircling said rod, said collar being carried by said frame and adapted to engage said rod in a binding relationship which limits the downward movement of said rod, a lever pivotally connected intermediate of its ends to said frame, one end of said lever connected to said collar and the opposite end of said lever projecting through one of said slits beyond the limits, of said frame to form an actuating handle, a second'lever, pivotally connected intermediate of its ends to: said frame, one end of said second lever being cona 9 nected to said collar and the opposite end of said second lever projecting through the second of said slits beyond the limits of said frame to form an actuating handle adjacent said first-named handle.

12. The structure defined in claim 11 wherein said frame is adapted to be removably secured to the side of a step ladder supported upright on a floor, said flange engaging one leg of said ladder adjacent the steps thereof so that the lower part of said flange rests on a step, a bracket engaging the outer edge of an adjacent non step-supporting leg of the step ladder, a pin extending between said bracket and said frame, and tightening means carried by said frame and engaging said pin to hold said bracket and said frame in position on said ladder.

13. The structure defined in claim 11 and in further combination therewith, a support removably secured to said frame and adapted to rest upon the lower of said surfaces, and wheels engaging said lower surface and connected to said support.

14. A drill mounting comprising a frame adapted to be supported between two spaced generally horizontal surfaces, a support connected to said frame and adapted to rest upon the lower of said surfaces, a generally vertically disposed rod slidably carried by said frame for longitudinal movements with respect thereto, said rod being extendable from said frame to engage the upper of said surfaces, means carried by said frame and engaging said rod for limiting the downward movement thereof with respect to said frame, releasing means carried by said frame and connected to said first-named means being actuated to permit downward movement of said r-od, a lever pivotally connected at one end to said support, the opposite end of said lever formed as a handle to actuate said lever, and a mounting head connected to said lever intermediate of its ends and adapted to receive a motor driven hand drill, whereby when the upper end of said rod is positioned in abutting relationship with said upper surface said lever is adapted to apply considerable downward force to the drill supported by said mounting head.

15. A drill mounting comprising a frame adapted to be supported between two spaced generally horizontal surfaces, a support connected to said frame and adapted to rest upon the lower of said surfaces, a generally vertically disposed rod slidably carried by said frame for longitudinal movements with respect thereto, means carried by said frame and engaging said rod for limiting the downward movement thereof with respect to said frame, releasing means carried by said frame and connected to said first named means being actuated to permit downward movement of said rod, a mounting head supported adjacent the upper end of said rod and adapted to receive a motor driven hand drill, a lever fulcrumed intermediate of its ends to said frame and connected with said first-named means, said lever being movable between two positions to raise said first-named means and said rod upwardly, and yielding resilient means connected to said frame and said first-named means to return said first-named means and said lever to their first position after movement of said lever from its first position to its second position, said lever being released to adapt said first-named means and said lever for a subsequent movement to raise said rod further upwardly when the upward movement of said rod by the first movement is manually maintained.

16. A drill mounting comprising a frame adapted to be removably secured to the side of a step ladder supported upright on a supporting surface; a generally vertically disposed rod slidably carried by said frame for longitudinal movements with respect thereto; and means connecting said frame and said rod for controlling the relative movement of said rod with respect to said frame; said frame comprising front, top and bottom portions and an end side forming a partial enclosure, said top and bottom portions being positionable parallel to said supporting surface and having apertures formed therein which are generally vertically aligned and which receive said rod extending therethrough, and said end side connecting said top and bottom portions angularly disposed With respect to a plane normal to said top and bottom portions and disposed generally parallel to the direction of projection of a step supporting leg of said ladder; and connecting means removable securing said frame to said step ladder, said connecting means comprising a supporting flange connected to said end side and having a lower edge engageable with a step of said step ladder, said supporting flange and a portion of said end side partially encompassing said step supporting leg.

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